During social categorization, a critical cognitive process that serves as the basis for group cognition and impression evaluation, a very specific type of categorization, or Cross-categorization, may arise, in which two or more social categories/dimensions of targets are simultaneously salient for participants, forming intersections of ingroups and outgroups across multiple categories. Research examining whether cross-categorization decreases or increases stereotyping shows conflicting results. Theoretical explanation from a categorization perspective emphasizes the effect of group membership and identification, whereas an individualization perspective highlights a “de-categorization” process in the multiple-category context. The limitations of existing research are the failure to reach an agreement about how to understand and investigate the conflicting results and to recognize the significance of stereotypes for an individual’s cognition and identification process. Future research should focus on the motivations and cognitive processes critical to the categorization perspective, the dominant category and processing styles under the individualized perspective, as well as the potential of a theoretical integration based on self-categorization process.

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van Rijswijk W., Haslam S. A., & Ellemers N . ( 2006). Who do we think we are? The effects of social context and social identification on in-group stereotyping. British Journal of Social Psychology, 45( 1), 161-174.
pmid: 16573878